Behavior Design

Behavior design is the discipline of treating model behavior as something to be actively crafted rather than passively accepted. Just as a UX designer thinks through how a user flows through an interface, a behavior designer thinks through how a model should respond across different scenarios, contexts, tones, and edge cases. It involves writing specs, creating training data, building evaluations, and iterating based on real-world feedback. The alternative — deploying a model and hoping it behaves appropriately — consistently produces products that disappoint or harm users in ways that were entirely foreseeable. For behavior architects, behavior design is the central practice of the role: everything else (prompting, training, evaluation) serves it.